I just want something small with ECC RAM
https://morefine.com/products/morefine-s500-mini-pc
The FAQ question reads a bit funny:
"Q19:Support ECC RAM？
YES. S500+ Support ECC RAM，
But compatibility requirements are higher, and cannot be used casually."
Also, these AsRock products:
I currently have a single 16 core/64 GB ECC Ryzen tower with ZFS that I'd like to break into a ZFS ARM ECC NFS server with a separate small form factor Ryzen or ARM compute cluster.